1. Code retreat
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2. Me
Adi Bolboaca
Organizational & Technical
Trainer & Coach
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3. Why?
Learn through pairing
Extend your comfort zone
Practice
Experiment
Learn new practices
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4. How?
1 day of coding
Choose a simple problem
6 pairing partners
On average 135 minutes of coding
6 different constraints
A lot of fun!
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5. How it started
CodeMash conference 2009
Gary Bernhardt
Patrick Welsh
Nayan Hajratwala
Corey Haines
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6. How it started
Repeatable
Day-long
Practice the fundamentals of programming
Intense day of coding
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7. Day structure
15' introduction
3 sessions of 45' coding + 15' retro&break
1h lunch
3 sessions of 45' coding + 15' retro&break
15' closing circle
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8. Principles
Language agnostic
Do not try to finish the problem
Delete the code after each session
Focus on practicing
Experiment each session
Have fun!
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9. Prerequisites
Computer
Coding environment
Testing framework
Source control (git, svn, etc)
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10. The four elements of simple design
1) Passes its tests
2) Minimizes duplication
3) Maximizes clarity
4) Has fewer elements
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11. Conway's game of life
Having an infinite 2D orthogonal universe
Being given an initial generation called a seed
The following rules are applied simultaneously
A live cell having less than 2 live neighbors dies
A live cell having 2 or 3 live neighbors lives
A live cell having more than 3 neighbors dies
A dead cell having 3 neighbors becomes alive
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12. First session
Ping-pong pair-programming
Option 1: evil coding
Option 2: silent pairing
Option 3: beginner's mind
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13. Conway's game of life
Having an infinite 2D orthogonal universe
Being given an initial generation called a seed
The following rules are applied simultaneously
A live cell having less than 2 live neighbors dies
A live cell having 2 or 3 live neighbors lives
A live cell having more than 3 neighbors dies
A dead cell having 3 neighbors becomes alive
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14. Programming by Wishful Thinking
1.Find a real-life scenario from top to bottom
2.Write an acceptance test on the scenario
3.Write the first unit test at the top
4.Whenever your test or implementation needs something, create a
stub
5.Go on writing next test until you reach the bottom layer
6.Only implement the stubs that you need for your vertical slice
7.Make the real-life scenario test pass
8.Write the next real-life scenario
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15. Only one decision at a time
1.Introduce only one notion at a time
2.Write down what notions you introduced
3.Note down the steps/tests you took
4.Write down which were the decisions you needed to revert from
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16. Code retreat
1 hour Lunch
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17. Tell don't ask
The internal state of a class is not accessible
A method call sends all the data needed to retrieve an
answer
Each class computes the output using only its internal
state
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18. Focus on refactoring
Use naming that reveals intent
Rename concepts to improve naming (use domain
language)
Extract duplicate identical chunks of code
Extract methods having the same noun into their class
Split methods containing Or, And in their names
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19. Code retreat
Choose your own practice
Decide with your pair in the first 5 minutes
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20. Closing circle
1) How did you feel?
2) What did you learn today?
3) What will you do differently tomorrow?
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21. Code retreat
Why?
Learn through pairing
Extend your comfort zone
Practice
Experiment
Learn new practices
www.mozaicworks.com

22. Contact me
●
Remote pair-programming
●
Unit testing workshop
●
Test driven development workshop
●
Clean code workshop
●
Refactoring workshop
●
Legacy code retreat
●
●
Working FAST and Safe with existing
code
Code retreat
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23. Code retreat
Extend your mentoring & training
capacity
Accelerate learning through
communities of practice
Grow your functional leaders and
top talents
http://www.mozaicworks.com
adrian.bolboaca@mozaicworks.com
@adibolb